Move tour, LOG and LOGN in utils, add vertices_from_set

ants.py

@@ -5,27 +5,8 @@ import math
 import random
 from collections import Counter
 import shortpath
-
-
-def LOG( *args ):
-    """Print something on stderr and flush"""
-    for msg in args:
-        sys.stderr.write( str(msg) )
-        sys.stderr.write(" ")
-        sys.stderr.flush()
-
-
-def LOGN( *args ):
-    """Print something on stdeer, with a trailing new line, and flush"""
-    LOG( *args )
-    LOG("\n")
-
-
-def tour(lst):
-    # consecutive pairs in lst  + last-to-first element
-    for a,b in zip(lst, lst[1:] + [lst[0]]):
-        yield (a,b)
-
+from utils import tour
+from utils import LOG,LOGN
 
 def euclidian_distance( ci, cj, graph = None):
     return math.sqrt( float(ci[0] - cj[0])**2 + float(ci[1] - cj[1])**2 )

uberplot.py

@@ -28,11 +28,11 @@ def plot_segments( ax, segments, **kwargs ):
         ax.add_patch(patch)
 
 
-def scatter_segments( ax, segments, color="black", alpha=1.0, linewidth=1.0 ):
+def scatter_segments( ax, segments, **kwargs  ):
     xy = [ ((i[0],j[0]),(i[1],j[1])) for (i,j) in segments]
     x = [i[0] for i in xy]
     y = [i[1] for i in xy]
-    ax.scatter( x,y, s=20, marker='o', color=color, alpha=alpha, linewidth=linewidth)
+    ax.scatter( x,y, s=20, marker='o', **kwargs)
 
 
 if __name__=="__main__":

utils.py

@@ -1,4 +1,20 @@
 
+import sys
+
+def LOG( *args ):
+    """Print something on stderr and flush"""
+    for msg in args:
+        sys.stderr.write( str(msg) )
+        sys.stderr.write(" ")
+        sys.stderr.flush()
+
+
+def LOGN( *args ):
+    """Print something on stdeer, with a trailing new line, and flush"""
+    LOG( *args )
+    LOG("\n")
+
+
 def adjacency_from_set( segments ):
     graph = {}
     for start,end in segments:
@@ -8,3 +24,17 @@ def adjacency_from_set( segments ):
         graph[end].append( start )
     return graph
 
+
+def vertices_from_set( segments ):
+    vertices = set()
+    for start,end in segments:
+        vertices.add(start)
+        vertices.add(end)
+    return vertices
+
+
+def tour(lst):
+    # consecutive pairs in lst  + last-to-first element
+    for a,b in zip(lst, lst[1:] + [lst[0]]):
+        yield (a,b)
+